Improvement in steam-boh-ers



W. A. LIGHTHALL.

Steam Boiler Watr Tube.

No. 35,942. Patented July 22, 1862.

1 PETE 500.,worc-um To hereby declare that the following is a full I r to the letters of ieference marked thereon, in

the water contained in a steam-boiler through the boiler, and from thencethrough the re in the boiler) by such rapid and forced movesteam surfaces.

, shown) and having a crown-sheet,- B, ex-

length between the front and back legs and of fuel is supplied to-the furnace.

, UNITED" "STATES PATENT'OFFIQE.

WILLTAM A. LIGHTHALL, or NEW YORK, NY.

lMPROVEMENT lN STEAM- BOtLERS.

Specification forming part of Letters Patent No. 85,942, dated July 2-2, 1862.

1'0 azz whom, it may concern:

Be it known that I, WILLIAM A. LIGHT- HALL, of the city, county, and State of New York, have invented a certain newand use ful Improvement in Steam-Boilers, and I do tubes, into which the water from the lower portion of the side leg of the boiler is forced by the forcepump F, the water from the pump being first delivered into the cross-pipe G, and after passing into and through the whole of the first section of the series of tubes is then forced and passed into the'second, and so on through the rest of the series until it is delivered into thecross-pipe 'H, from whence it passes into the top portion of the boiler through the connecting-pipes a a a The first of the series of tubes rests at its back end on the bracket 1),- and the cross-pipes G and H are so attached and connected with the boiler and with the pipe 0 from the pump that by the removal of their connecting-bolts the whole of and exact description of the same, reference being had to the accompanying drawings, and

Figure 1 is a side elevation; Fig. 2, an end elevation; Fig. .3, a central longitudinal section, and Fig. 4 a central cross-section.

The nature of my invention consists in creating a'forced and continued circulation of the lower section of the series of the tubes of maining sections of the series of the same to the body of the boiler by means of a proper force-pump operated by any required or desired means, which receives the water from the boiler at or about the coolest part of the boiler and passes it rapidly and forcibly through the said tubes in order that the evaporation of the water maybe increased (beyond the amount that would be produced by the natural and unforced circulation of the water out for examination or repair.

The force-pump F can be operated either by the main engine or by a separate engine, as may be desired; In the latter case the engine may also be used as a pumping, a blower or a donkey engine.

ducts of combustion-in the furnace pass off.

The fire in the furnace not only passes across and among and between the tubes E, but also acts with great'force on the front, back, ment of the water through the heated tubes and side legs of the boiler and upon the crownand by its constant'and' continued movement and change of direction therein.

My invention is adapted to a great'varietyof boilers; but the one presented in the accompanying drawings is preferred by me, for the reason that the series of heating-tubes are so arranged and attached to the body of the boiler as to be readily detached and moved for purposes of minute examination and repair, while the body'of the boiler affords suhicient room for the quantity of water necessary to be carried, and yet furnish active heating and furnace is utilized to the greatest possible degree before the waste gases and wasted proried off through the smoke-stack I.

My invention is only applicable when fresh water can be used in-the boiler, as in cases wheresalt-water or water containing sediment ary matter is used the deposition" of salts or sediment upon, around, and among the tubes legs,would not only materially lessen their efiective action by the deposition resisting and retarding the action of the heat upon them, but would alsotend to destroy them by the Ais the body of the boiler, made in wagontop form (with side, front, and back legs as tendingfrom the front to the back leg of it.

0 are the grate-bars,forming the base of the that a great variety of modifications in the furnace, which are equahiu length to the forms of boilers and' in the arrangement of the heating-tubes can be made, while the essence of my invention the forced and continued circulation of the water in theboilerjover its heating-snrfaces is preserved; and I do not,

widthequal to the width between the side legs. 1) are the furnace-doors, through which the E is thevseries of six rows (in height) of the series of tubes can be removed and taken I is the smoke-stack,through which the pro- I sheet B,-so that the effect of the fuel in the ducts of combustion enter into and are can and upon the surfaces of the crown-sheet and corrosive action of these deposits'upon them, i It will be apparent to practical engineers therefore, confine myself to the application of the same to the form andarrangeinent of the boiler shown.

I claim, as advantages of the improvement herein set forth, that a boiler of given capacity can be made of less weigh t, will occupy less space, will cost less for its construction, will .require less weight of water to be carried in it, will present greater evaporation (heating) sprface, and therefore evaporate more water in the same space and with the same weight of boiler than any boiler now used. I

I am aware that water has been forced by mechanical means into the heatingtubes of a boiler to produce rapid evaporation; but in all such cases the supply of water to be taken into and passed through the tubes was entirely received from and delivered by an external supply, the circulation in the boiler, if any, be

Producing a forced and continued 'circulw.

tion of the water in a steam-boiler, either through the tubes of the boiler or through and in the shell or body of the same, by mechanical means, as and for the purposes herein set forth. i

' WM. A. LIGHTHALL. Witnesses:

FRANCIS S. LOW, JOHN G. BOLANDER.

temperature between the coolest 

